bigbuck, my concern on buying the new motor and control is this: It doesn't make sense to me that an electric motor would lose power. My understanding is that they either work or they don't. My motor does seem to work, albeit poorly.

Normally, if it spins for the diagnostic test, the motor and controller should be okay. But, you said it makes a noise. This is a three phase motor but will run noisily on two phases. There should be a tech sheet in the console tucked behind the pressure switch. It will tell you how to do a motor phase test. But I think you ordered what you need, the motor and controller.